Measuring device for spray applicators in prevention of offset and the like



y 4, 1953 A. J. JENNER 2,645,529

MEASURING DEVICE FOR SPRAY APPLICATORS IN PREVENTION OF OFFSET AND THE LIKE Filed Jan. 2, 1951 4 Sheets-Sheet 1 -IO ,L. m 25 INVENTOIQ A THUQ JENNEE I rrogav July 14, 1953 JENNER 2,645,529

MEASURING DEVICE FOR SPRAY APPLICATORS IN PREVENTION 0F OFFSET AND THE LIKE Flled Jan 2, 1951 4 Sheets-Sheet 3 JNVENTO/P APT we J s/v/vze WA] 7 ATTO/QNEV July 14, 1953 JENNER 2,645,529

} MEASURING DEVICE FOR SPRAY APPLICATOBS IN PREVENTION OF OFFSET AND THE LIKE Filed Jan. 2, 1951 4 Sheets-Sheet 4 INVENTOP AQTHUQ J. EMA/E BY @Q Q ATTORNEY continuously rolled printed sheets.

Patented July 14,

MEASURING DEVICE FOR SPRAY APPLICA- TORS IN PREVENTION OF OFFSET AND THE LIKE Arthur J. Jenner, Arlington Heights, 111., assignor of one-half to Alexander F. Szymborski, Chicago, Ill.

Application January 2, 1951, Serial No. 203,947

25 Claims. 1

This invention relates to spraying devices and more particularly to dry spraying devices for use in high speed printing operations for precluding printing offsets on sequentially disposed printed sheets as they are delivered by the printing press, although certain features thereof such as the measuring instrumentalities. may be used with equal advantage for other purposes such as packaging predetermined units of dry substances and the like.

It contemplates more especially the provision of improved measuring instrumentalities for charging a spraying device with a predetermined quantity of dry powder, such as rice flour, and to intermix therewith a sufiicient quantity of air for spraying application in uniform expansive films on successive imprinted superposed or rolled sheets to prevent offset. This application is a continuation-in-part of my copending application Serial No. 590,181, filed April 25, 194 (now forfeited).

Numerous types of non-offset sprays have been in use. These involve gum arabic and similar transparent film producing mediums interposed between successive printing sheets or over continuous sheets rolled as they come off the press. Another common non-offset dry spray consists of rice ficur which is co-mingled with or for application between the contacting surfaces of continuous rolled or successive printing sheets. The dry-nomoffset spray is thought most desirable in that it is the least offensive to the attendants and the equipment of a printing plant. However, known dry spraying apparatus are not entirely suited to the prevention of printing offsets owing to the inability to control the quantum of each offset dry charge and to overcome the substantial humidification of the spraying charge prior to the application thereof between successive or A highly or substantially humidified spraying charge proves troublesome owing to the creation of smears and adhesion between successively stacked or continuously rolled printed sheets as they come off the press with the ink impressions thereon still wet.

Moreover, the amount of each powder charge or spray must be accurately measured and adjustably controlled to avoid superfluous spraying, eliminate stifling air contamination in the rooms where the machines are housed, and avoid damage to the printing machinery that would otherwise become lodged with superfluous powder, thereby causing abnormal wear and maintenance. Cleanliness and flexibility of control 5's in the distribution of the dry film is also an important factor which insures uniformity and maximum effectiveness of the offset spray charge timed to the operation of each printing press.

With the teachings of the present invention, the amount of the spraying charge for each application and the small or negligible humidification has been controlled to a practical degree with simplicity of structure and dependability in operation. Controlling the amount of the dry spray for each application is as important as the degree of dryness thereof unaffected by the humidity of the atmosphere and the air .co-mingled therewith. Consequently, both of these accomplishments have been effected with a high degree of dependability of operation, simplicity of structure and improved results.

One object, of the present invention is to simplify the structure and improve the operation of devices of the character mentioned.

Another object. is to provide an improved dry spraying device to preclude printing offsets between successive sheets as they come off a printing press.

Still another object is to provide improved feeding and charging instrumentalities in dry spraying apparatus.

A further object is to provide a constantly charged vessel with a dry spraying medium and transferring a predetermined charge to a stream of air just prior to its application between successive sheets in timed relation with the printingthereof.

A still further object is to provide improved feeding, charging and spraying instrumentalities coordinated to. provide an invisible film of dry powder, such as rice flour, between successive imprinted sheets.

Still a further object is to provide improved control means in conjunction with feeding, charging and spraying instrumentalities to supply an invisible dry film between imprinted sheets to eliminate offsets therein.

Other objects and advantages will appear from the followingdescription of an illustrative embodiment of the present invention.

In the drawings:

Figure 1 is a front view in elevation of the dry powder feeding and measuring instrumentalities embodying features of the present invention.

Figure 2 is a side view in elevation of the instrumentalities shown in Figure 1, with the parts in their initial position.

Figure 3 is a side detail view in elevation of the scrapers shown assembled with the measuring vessel in Figure 2.

Figure 4 is a side detail view in elevation of the .ure 9.

Figure 12 is a sectional view taken substan- -tiall'y along line XIIXII of Figure 8.

. "The structure selected for illustration is not intended to serve as a limitation upon the scope :trative thereof.

measuring instrumentalities shown in Figure 2 with the hopper and powder conveying mechanism removed and the parts in their extreme position of movement viewed from line IVIV of Figure 1. 1

Figure 5 is a sectional plan view taken substantially along line V--V of Figure 1.

Figure 6 is a perspective detail View of the measuring spoon and control mechanism with the parts positioned as shown in Figure 2.

Figure 7 is a detail perspective view similar to Figure 6 with the parts positioned as shown in Figure l.

Figure 8 is a plan View of the spray increment distributor for directing an expansive film against the imprinted paper.

Figure 9 is a side view in elevation of the spray distributor shown in Figure 8.

Figure 10 is a fragmentary sectional view' in elevation showing the relationship between the 'measu'r'ing and distribution 'instrumentalities. I

Figure 11 is a bottom plan view of an individual bell distributor shown assembled in Fig- .orteachings of the invention, but is merely illuste'achings depending upon the dictates of com- -mercial practice.

The present embodiment comprises a bracket .llladapted to be fixed to a high speed printing press (not shown). proximate to the delivery table thereof for attachment to a complemental bracket arm H through the medium of suitable fasteners (Figures 1 and3). The bracket arm l l terminates, in this instance, in a bracket [2 cast or otherwise shaped to provide arms l3l4 for attachment to a horizontally disposed cylindrical bearing 15 comprising the top of a frame housing"|6 (Figure'l for supporting instrumentalities to be hereinafter described.

The bracket Semi-circular boss ll which receives a screw Threaded fasbearing !5 of the housing E6 to serve as a support. therefor.

VA substantially semi-spherical supply vessel or hopper 2! is supported by a bracket 22 that is screw fasteners 23-44 (Figure 1). The bracket 22 terminates downwardly in a substantially triangular plate 25 for attachment of the supply vessel or hopper 2| thereto by aplu'rality of suitable fasteners 26. The bracket 22 serves to support the hopper 2| which is kept filled with a suitable dry powder such as rice flour. The lower end of the supply vessel or hopper 2! is provided There may be considerable variations and adaptations of all or part of the i2 has a central substantially A terior cross-section of the vessel or hopper 2| to conduct the spray powder up and along the Wall thereof as indicated by the arrows in Figure 1. The substantially oval spray conveying tube 30 terminates upwardly and over toward the housing 16 so that the discharge end 3| of the tube 30 terminates within the upper region of the vessel or hopper 2| for discharging the dry powder into a leveling bowl 32 supported and partially disposed through a complemental opening 33 in the supply vessel or hopper 2| (Figure l) as will appear more fully hereinafter.

An electrical heating band or coil 33 is shaped to provide a conically shaped ring that surrounds "the body of the supply vessel 25 for the connection of electrical wires to the plug 3 3 provided thereon. The electric heating band or coil 33 is preferably furnished with a built-in thermostat that maintains the contents of the supply vessel dry against any possible acquisition of humidity that would be detrimental thereto as an invisible offset film between successive printed sheets as they come off the printing press.

The self-leveling bowl 32 has an upwardly ex tending axial tubular boss B l to which a vertical shaft 35 is attached to serve as a support therefor .and impart rotation thereto as willbe more fully described hereinafter. To assist in the support of the self-leveling bowl 32, an axially depending bearing point 36 is fixed to the bottom thereof for engagement in a vertical bearing 31. The vertical bearing-3? is provided with an exterior thread 33 for engagement by an adjusting nut 39. The bearing 38 projects through a horizontal arm 48 comprising part of a bracket 4! fixed to the exterior of the supply vessel 2 l. The vertical bearing bracket 4| is attached to the exterior of the supply vessel or hopper 2| by means of suitable fasteners 42 (Figure l) to support the vertical bearing 3? in any desired position within the range of its exterior thread 38 to maintain and support the self-leveling bowl 32 in a desired vertical position and to compensate for wear therein.

The leveling bowl rotating shaft'35 is journalled ina vertically disposed bearing sleeve 13 attached to thehousing l6 by means of bosses 44l5 formed integral therewith and receiving threaded fasteners it therethrough. The bearing sleeve -43 has-a lower tapered extremity 3'! which receives the vertical bowl rotating shaft 35 that terminates at its upper projecting end in a worm gear 48 attached for rotation with the shaft 35. The worm gear- E8 meshes with a horizontal worm 49 fixed to a horizontal shaft 59. The horizontal shaft 50 is journalled in the top horizontally dis- -;attached' to the housing frame it by means of D ed yli drical bearing 1-5 comprising the top of the housing it. It should be noted that the toplhorizontal bearing 15 comprises spaced sections 5 |--52 to provide room 53' to accommodate theworm 49 therein andbetween the bearin sections 5 l--5-2 Thehorizontal top housing bearing sections El-52 are maintained in rigid axial alignment by reason of their integral formation withthe housing frame I6 and the attachment with a high pressure nozzle 27' (Figure 1) conlthe-wp'bracket [l7 thereto y ans 0f the nected to a suitable compressed air supply and. controlled by an automatic valve (not shown) that is operated by the printing press with which the spray mechanism described herein is fitted. The .air nozzle 2'! projects horizontally into and along the rounded bottom 28 of the hopper 2| and is positioned proximate to the entrance orifice 29 of an enlarged powder supply conveying tube 30. "The power supply tube is, in this instance,

fasteners l9 (Figure l).

The shaft-5G projects beyond the bearing section5l toreceive a spacer collar 54 against which a cam plate 55 is mounted on the shaft 50 (Figure -5 The cam plate 55 confronts a friction disc 56 having a plate 5? reciprocally mounted on the shaft 50 to confront the friction plate 58 that is urged in frictional contact with the cam plate 55 responsive to the urge of compression spring 58 substantially oval and complemental to the inthat envelope the shaft 50 and abuts against a is effected by a suitable source of power such as an electric motor (not shown) that is operatively connected to a shaft extension (it (Figure l) coupled for attachment to and rotation with the shaft 56 by means of a rigid coupler 62.

The cam plate 55 is disposed in the path of a cam follower wheel 63 that idles on a stud 64 carried by an enlarged boss 65 formed in a link 66. The link 68 has a furcated bracket arm 67-68 at one extremity thereof to receive a stationary bracket 69 therebetween for pivotal mounting upon a pin it that is carried by the bracket 69. The link bracket arms El68 are pivotally supported on the pins It carried by the stationary bracket 69 that has a forwardly inclined and depending plate l'I extending therefrom (Figures 1 and 2) for attachment to a horizontal bracket 12 rod to receive a compression spring i9 thereff" against. The compression spring I9 envelops the rod 75 for substantially the entire length thereof with the lower end abutting against a washer 80 fixed torthe rod 75 proximate to the lower end thereof.

7 The lower end of the rod 1'5 terminates in a bossfijthat receives ascrew 82 therethrough for mounting in the projectinglip 83 of a crank 3d.

lhe crank 8'2 with-itslip or arm 82 is mounted on a stub shaft 85 that is journalled in a bearing 86 carried by a lever arm 8'! that terminates in fur? cated spaced ears S8 to receive a bracket 89 therebetween for pivotal mounting of'the lever arm 8'5 by means of a pintle 9B. The pintle 96 extends throughthe furcated ears 88 of the lever arm 8? for support in the bracket 89 that extends upwardly to terminate in a vertical plate 9| for attachment to the housing frame extension 12 by means of screws 92. A pair of curved fiat springs 93,% are attached to the mounting bracket 81 as at 95 to extend around the lever arm 81 and engage therebeneath as at 95 to normally urge the lever arm 8? in a counterclockwise direction (viewed from Figure 2) limited'by the lever arm forward extension 97 projecting a rectangular vertical opening 98 provided in the correspondingly shaped stop frame 99 that is formed integral with a vertically extending threaded shank I00.

The threaded shank 586 projects through a vertically bored bearing bracket IOI that is attached to the housing is (Figures 1 and 2). Lock nuts MHZ-A63 engage the limiting frame shank I08 on both sides of the vertical bearing bracket it! to enable the vertical and positioning adjustment of the stop frame 99. It should be noted that the stub shaft 85 carrie a sub-assembly shown in perspective in Figures 6 and '7 comprising a rotary movement limit plate Ills having ears I il5li!6 disposed in the path of a trip Hill. The trip It! has a horizontal shank IE8 provided with a boss I59 intermediate the ends thereof for pivotal mounting on a pin I In. The pin I Ii] is carried by spaced plates I I I-- IIZ fixed to the lever arm bearing 85. The trip I0! is pivotally disposed in the path of the slot A convexly v H3 for registry therewith as the lever arm 8'! is elevated to its extreme upward position in a counterclockwise direction (viewed from Figure 4) at which time the trip shank I08 abuts against a horizontal stop arm II I that comprises a part of a plate I I5 fixed to the edge of the stop frame 99 by means of fasteners I I6. A concavo-convexo scooping spoon III is oscillatably mounted through it arm H8 and its terminal boss II9 (Figures 6 and '7) to the other extremity of the stub shaft for oscillation therewith in the path of the levelling bowl 32 to scoop predetermined increments of powder therefrom when oscillated in a counterclockwise direction (viewed from Figures 2 and 10) for discharge into the intake 520' of a distribution housing 12! (Figures 8 to L0) as will appear more fully hereinafter. To this end, the scooping spoon I I! is normally urged to its extreme clockwise position (viewed from Figure 2) by means of a flat spiral spring I22 which has one extremity 23 anchored to the spoon shank H8 and the other extremity I24 fixed to the lever arm bearing boss. 86.

In order to avoid the reverse clockwise movement of the scooping spoon l I'i' (viewed from Figures 2 and 4) from interfering with the level of the powder in the bowl 32, it is held against return movement by the registry of the trip Ill! in the slot I! I3 provided in the oscillation limit plate Iil i. This holds the scooping spoon H! in its uppermost position at the end of its operative strokeuntil the lever arm 8! elevates to its extreme position, whereupon the trip shank I03 will abut against the fixed stop II 4 (Figures 6 .3 and '7) and displace th trip It? from the slot i I3, thereby permitting the scooping spoon I I? to return to its initial position responsive to the urge of the spiral spring B22 in operative association therewith. The exact increment of powder can be controlled with great accuracy by raising or lowering the stop frame 99 whose positicn is accurately controlled by the lock nuts Ill2-iil3 in threaded engagement with the threaded frame shank I39 on both sides of the housing frame boss lEiI. This will enable more or less powder in each increment to be scooped from the bowl 32 that constantly rotates relative to confronting scrapers I25-l26 (Figure 3) fitted for contact with the top peripheral end surface of the bowl 32 and to its lower exterior surface, respectively. I

. An expansion spring 521 is disposed between pins i28-i29 extending from the scraper plates i25--i26 (Figure 2) to ncrmally urge the scrapers lZ-iilt in contact with the top peripheral edge and the lower exterior surface of the bowl 32 to maintain the interior level and the exterior clean at all times from the powder that is conveyed through from the supply vessel or hopper 2! in the manner previously described.

The scrapers I25--i25 (Figure 3) are pivotally connected together as at I30 and thes scrapers I2EI 26 are shaped as complements of the leveling bowl 32 for frictional association therewith. The complemental scrapers l25i26 have a bracket lSI fixed to the end boss I32 of the lower scraper E25 fo attachment by any suitable fasteners 33 to the supply vessel or hopper 2! in a position to effect the support thereof in operative contact with the leveling bowl 32.

It will thus be apparent thatwith the accurate raising or lowering of the scoop II! relative to the constant surface level of the powder in the bowl 532, accurate control of the amount of contents that is to be scooped therefrom to constia-mtgsae 7 -tute :an individual charge :that is sprayed on a :she'et,- can 'be. controlledwithin minute tolerances =to providean elfective invisible or impalpable' dr-y film to effectivelyprevent-any possible oftsetbet-ween -successive printed sheets'delivered by scoopinggofthepowder-contents toa positionin the :air screen, as will 'appearmore fully herein- .atter, ithereby permitting the cam 55 to 'slip on the. shaft r'iil relativeto rthe spring actuated clutch 156:5:'1. Thus the instrumentalities:willbeheld stationary :to :maintain the scooping spoon 1 l momentarily stationary to bring "the :charge of the scooped powder in-a predetermined position for spraying atthetime'a'chargeof airis released through the long nozzle .13? .providedxinthe-dis- -itribution:housing 1:21 to surge'therethrough as will appear moreifully hereinafter.

"The. operation of the solenoid 8 is synchronized with the operation of the printing press (not shown) :through .a switch 138 thathas an operating lever l 39'that'carri'es a roller Hit. The roller 1 is mountediin confronting relation with a cam [41 carried by a shaft 14.2 that is intergearedto the feeding :mechanism of a printing press and is thus rendered cperativezbetween the feeding of successive imprinted sheets. The compressed air line leading to the nozzles 2'? an {3? (Figures 1 and 8 respectively) communicate with a .valve 143 (Figure 5) which, in turnyhas anair supply pipe 144 communicating therewith to maintain a constant supply of air under pressure to the valv 1E3. The valve 1 33 may also be operated by an arm I' l-5 having a roller 1% in contact with the printing press feeding control cam 14! .so :that .air will be released in proper timed'relation through the nozzles'Zl and 8'31 to .maintain the leveling bowl 232 over-supplied with dry powder by scraping therefrom and to provide a surge :of air for distribution of the predetermined increment of powder to the distribution housing 121 As shown, the predetermined increment scooped .from the bowl 32 is transferred by the scoop 1 ll to theintake 120 of the distribution housing 12! for downward gravity displacement therein and thereafter circuitously driven through a com mingling chamber h ll by the charge of air through the nozzle I37 'thatenters the conduit 148 interposed between the intake i2!) and the commingling chamber Ml. A plurality of tubular arms H-l51 have circular chamber complements 152-453 that permit the'arms 1 56-15! to pivot relative to each other and the corn- .mingling chamber 14! so that th bell housing 154155 positioned at their extremities and in communication therewith may be adjustably positioned relative to each other and the imprinted sheets to direct the spray in an'expansive film thereon. The air charge through the nozzle 13? is timed with the supply of a powder charge deposited by the scoop Ill in the intake 120 to effect its diffusion and commingling with air at a high velocity around the commingling chamber 141 of the distribution housing 121.

The diffused charge of powder will be blown to .the bell housing 154-455 that has downwardly "converging peripheral edges -'!-'5'615"|' which merge substantially alon a diametricline thereof. The bell housing 154- f comprise enlarged discharge chambers 5 to effect an expansive "spray of powder in a finely divided impalpa'blefilm'for controlled impingement on predetermined areas in the path thereofsubstantially over the printed pa'peras dliveredby the printing pressand-deposited on *the printing-press bed therebelow not shown). So'that-there will lee-uniform diffusion and-distribution-the bell housings 154-155 are internally provided with conically shaped and uniformly spaced concentric distribution rings -1'58,=in this instance five, that are braced. by'in- 'tersecting plates 15!! to provide expansivedirectional paths for the powdered offset charges emanating therefrom.

The electric switch 138 is electrically connected through lead wires 160-461 to the solenoid 136. Another lead wire 162 connects the solenoid 1 33 136 throughthe control switch '1 38=to=a=suitable source of electrical power 163 (Figure 5), thereby opening and closing the circuit to the solenoid 1'3'6 bythe timed operation of the printing press cam shaft 152. It will appear, therefore, that the'intermittent os'cillatable-operation of the scooping spoon-i i1 is accurately timed with the air charg through the control of the air valve 153 that is also responsive to the cam 141. This will insure a constant over-supply of powder to the levelling 'bowl 3 2.

It will be apparent from the foregoing that a very simple, dependable, and carefully controlled'drypowder or similar-substance measuring device has been provided and while illustrated in connection with spraying apparatus for operation in conjunction with a high speed printing press to provide an invisible offset film synchronized with the impressing roller mounting shaft of the printing press, its use has a muchwiderfield of application in packaging and other processing.

While I have illustrated and described a preferred emobident of this invention, it must be understood that the invention is capable of considerable variation and modification without deipartingtfrom .the'spiritofthe invention. I, there- 'fore, do not wish to be limited'to the precise details of construction set 'forth, but desire to avail myself of such'variations and modifications as come within the scope of the appended claims.

Iclaim:

1. .In a device of *the'character described, the combination with a compact dust material supplysource, of a compressed air'supply source for directing air under pressure and velocity along a predetermined path of flow, mechanical measuring fsc'o'oping means in and proximate to-said .supply source for'transferring predetermined increments of solid dust'ma'terial from said supply source to said predetermined path of air flow, fmeans for releasing predetermined charges of :air along said path of air flow in timed relation with the transfer of dust material increments thereto, and an enlarged discharge chamber for controlled and confined expansive e'fllu'ent distribution of the predetermined increments of dust material in the form of an extremely light dry film.

2. In a device of thecharacter described, the combination with a compact dust material supply source, of means for maintaining a constant supply level of dust material in said supply source, a compressed air supply source for directing air underlpressure and velocity along a predetermined path of flow, means adjustable relative to the dust material supply level for transferring predetermined increments of solid dust material from said supply source to said predetermined path of airflow, and an enlarged discharge chamber for controlled expansive effluent distribution of the predetermined increments of dust material in the form of an impalpable dry film.

3. In a device of the character described, the combination with a compact dust material supply source, of means'for maintaining a constant supply of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, adjustable mean proximate to said supply source for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, means for releasing predetermined charges of air along said path of air flow in timed relation with the transfer of dust material increments thereto, and enlarged means adjustably positioned externally of said dust material supply source for confining and controlling the ex pansive efiluent distribution of said increments in the form of an impalpable dry film.

41. In a device of the character described, the combination with a dust material supply source, of means including a scraper for maintaining a constant quantity of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, adjustable means for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, and means for controlling the expansive effluent distribution of said increments in the form of an impalpable dry film.

I 5. In a device of the character described, the combination with a dust material supply source,

of means for maintaining a constant level'of' dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, scooping means adjustable relative to the dust material supply level for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, and means for controlling the expansive efiiuent distribution of said increments in the form of an impalpable dry film.

6. In a device of the character described, the combination with a dust material supply source, of means for maintaining a constant level of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, conveying means adjustable relative to the dust material supply level for transferring pre determined increments of dust material from said supply source to said predetermined path of air flow, means for controlling the expansive efiluent distribution of said increments in the form of an impalpable dry film, and means for varying the relationship of the effective position of said rotary scooping means to the'level of the dust material in said supply source.

7. In a device of the character described, the combination with a dust material supply source, of meansfor maintaining a constant level of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, rotary scooping means adjustable relative to the dust material supply level for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, and means for releasing predetermined charges of air along said path of air flow in timed relation with the transfer of dust material increments thereto for expansive distribution in the form of an impalpable dry film.

8. In a device of the character described, the combination with a dust material hopper, of a levelling container for receiving dust material from said hopper, scooping means mounted for rotation relative to said levelling container, means for rendering said scooping means adjustable relative to the dust material supply level to transfer increments of dust material therefrom, an air housing in the path of said scooping means for receiving the increments of dust material from said levelling container, and air emitting means in said housing for discharging impulses of air against the increments of dust material to effect the effluent distribution thereof from said housing in a thin expansive impalpable dry film.

9. In a deviceof the character described, the combination with a dust material hopper, of a levelling container for receiving dust material from said hopper, scooping means mounted for rotation relative to said levelling container adjustable relative to the dust material supply level to transfer increments of dust material therefrom, means for varying the relationship of the effective position of said rotary scooping means to the level of the dust material in said supply source to control the increments of dust material transferred therefrom, an air housing in the pathof said scooping means for receiving the increments of dust material from said levelling container, and air control means in said housing for discharging impulses of air against the increments of dust material to effect the efiluent distribution thereof from said housing in a thin expansive impalpable dry film.

10. In a device of the character described, the combination with a. dust material hopper, of a levelling container for receiving dust material from said hopper, conveyor means interposed between said dust material hopper and said levelling container for seeping the latter supplied with dust material, means including a scraper cooperating with said levelling container to maintain a constant quantity of dust material in said levelling container, scooping means adjustable relative to said levelling container and mounted for rotation relative thereto for transferring increments of dust material therefrom, an air housing in the path of said scooping means for receiving the increments of dust material from said levelling container, and air control means in said housing for discharging impulses of air against the increments of dust material to effect the effluent distribution thereof from said housing in a thin expansive impalpable dry film.

11. In a device of the character described. the combination with a dust material hopper, of a levelling container for receiving dust material from said hopper, conveyor means interposed between said dust material hopper and said levelling container for keeping the latter supplied with dust material, means including a scraper cooperating with said levelling container to maintain a constant quantity of dust material in said levelling container, scooping means mounted for rotation relative to said levelling container and adjustable relative to the dust material supply level to, transfer. increments. of. dust. material, there.- from, meansfor varying therelationship ofthe efiective-position of saidrotaryv scooping means. to. the level of the dust material in said-supply source to control the, incrementsof dustmaterial transferred-therefrom, an air housing-in thepath of;v said-scooping meansfor, receiving the. increments of dust materialfrom-said levelling con tainer, .aircontrolmeans in'said housing. for discharging impulses. of. air against the, increments of. dustmaterial, andmeans to cheat the effluent distribution thereof from said housing in a thin expansive impalpable dry film;

12.- In a device of the-character described, the combination withadust material hopper, of. a levelling container.- for receiving dust material from said hopper, conveyor means interposed be.- tweenisaid dust material hopperr-and said level.- ling-container'for keeping the latter supplied with dust.material,.means including a scraper coopcrating withsaid levellingcontainer to maintain aconstant quantity of: dust material-imsaidlevelling-.container, scooping-meansmounted for re.- tation relative to said levelling container: and adjustable relative to-the dust. material .supplylevel to i transfer.- increments of dust material ,there, from, means for varyingthe-relationship. of the effective; position of said' rotary scooping. means to. the level of the dust: materialin saidsupply source tQ-COIltI'OlethB increments of dust mate-- rial transferredtherefrom, anair housing-in thepath of said: scooping means. for receiving the. increments of dust material. from said levelling. container; air. control:means.- in said housing for discharging; impulses of; air against, the increr ments, of. dustmaterial, and means-to" effect theefiluent distribution"thereofifrom :said housing-in azthinexp ansive impalpable dry film.

13; In a. device-of the-character described,- the combination with a dustmaterial=hopper, of a levelling container for receiving dust material from said hopper, scooping meansmounted-for rotation relative tor said levelling container and adjustable" relative to': the. dust material supply 1eve1 to." transfer increments of dust material .1. therefrom, an air: housing inthe path of said;

scooping means'forreceivmg the incrementsof' dustimateria'l from said-zlevellingcontainer,- a dis-- tribution discharge chamber: communicating with said airchamber; airremittingmeans in. said housingfor-discharging impulsesot air againstthe=-incrementsof dustmaterial, and'means to effect the eificient'distribution thereof from said: housing: and through saiddischarge chamber in athin: expansive impalpable:dry=film.

14; In a device of: the character. "described; the combination: with a dust material hopper, ofa levelling. container for'receiving dust material from-saidhopper; scooping means: mounted-for rotation: relative to said levellingcontainer and adjustable relative to the dust" material supply" levelt for transferring increments of: dust mate rial therefrom, an air housingin'thepathrof said scooping means for receiving the increments of dustmaterial from said levelling-container,-a dis tribution discharge chamber communicating'with' said air chamber, air emitting meansin said' housing for dischargingimpulses of' air against: theincrements of dust material, meansto effect theefiiuent distribution thereof from said housingi, and through said discharge chamber in athin expansive impalpable -dry film, and baffles-in said discharge chamber to insure a more uniform: expansive-spray of the-dust material increments.

15. In adevice of the character described, the

combination. with adust material hopper; of. a levelling.- container for receiving. dust material from saidhopper and said levellingcontainer for keeping the. lattersupplied with dustmaterial, means including ascrapercooperating with said levelling container to maintain a constant quantityof dust-material in said levelling container, scoopingmeans' mounted for rotation relative to said levelling container and adjustable relative tothe dust material supply. level for. transferring increments of dust material. therefrom, an air. housingin thepath' of said scooping means for. receiving theincrements of dust. material from saidilevelling container, a distribution discharge chamber; communicating with; said: air chamber, air. emitting means :insaid-housing. for'dischargingimpulses of air against theincrements of dust material, andmeans to effect theeffiuent distribution thereof from. said housing andthrough. said. discharge chamber in a thin. expansiveimpalpabledry film.

l6. .Ina. device- 0f, the. character described, .the combinationwith a dust material hopper, of a levelling; container. for receiving dust material from said-hopper,- conveyor means interposed betweengsaid dust: material. hopper and said levels ling container for keeping the. lattersupplied with dust: material; means including a. scraper cooperating with said levelling container to maintaimaconstant quantity of Idust'material in saidwlevelling:container, scooping means mounted for-rotation relative; to saidlevelling container adjustable relativeto thedustma-terial supply levelv for transferring: incrementszof' dust mate-- rial I therefrom; meansgforvarying the position of saidscooping. means relative'to said levelling container to: controlthe. increments of dust material. transferred therefromyan airhousing inxthe'path of said, scooping means;. for receiving the: increi ments of dust material from saidilevellingcontainer; a. distribution; discharge chamber communicatingr With saidi air" chamber; air control meanszint said housing for discharging impulses of air againstvtherincrements of'dustmaterial; and" means to effect theeffluent distribution" thereof from said housing: and through .said discharge chamber in: a; thin; expansivezimpalpable 17'. In a; device: ofrthe character described; the

combination with a dust material hopper, of a levelling container. for receiving: dust material from said hopper, conveyor means interposed between said-dust material hopper and said levelling: container for' keeping thelatter supplied with dust'smaterial; means-including a scraper cooperating-with said levellingcontainer tomaint-ain a constant quantity of dust'material in said levelling container; scooping'means mountedfor rotation relative to said levelling container and adjustable relative to the dust material'supply level for" transferring increments of dust material therefrom; means for varyingthe relationship of the efiective position of said rotary scooping means to the level of'the dust material in said supply sourcetov controlth'e increments of dust material transferred therefrom; an air housing in. the path of said scooping "means for" receiving the increments .of'dust material from-said levelling container, adistribution. discharge: chamber. communicating With said air chamber, air' control means-in said housing for discharging impulsesof 7 air against the increments ofdust 'materia-l, means: to efiiect. the effluent distribution thereof from said housing and through. saiddis charge,- chamber, in :a. thin expansive; impalpable.

dry film, and baffles in said discharge chamber to insure a more uniform expansive spray of the dust material increments.

18. In a device of the character described, the combination with an air housing, of means for supplying premeasured increments of dust material to said airhousing, air valved nozzle means in said air housing for producing an expansive dry spray of said dust material increments, and a distributor bell having an outwardly flaring discharge orifice communicating with said housing to receive the dry expansive spray therefrom for controlled discharge over a substantially predetermined area.

19. In a device of the character described, the combination with an air housing, of means for supplying premeasured increments of dust material to said air housing, air-valved nozzle means in said air housing, means for operating said air valved nozzle means in timed relation to said increment supplying means for producing an expansive dry spray of said dust material increments, and a distributor bell having an outwardly fiaring discharge orifice communicating with said housing through a tortuous intermediate chamber to receive the dry expansive spray therefrom.

20. In a device of the character described, the combination with a compact dust material supply source, of means for maintaining a constant supply of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, adjustable means for transferring predetermined increments of dust material from said supply source to said predetermined path of air fiow, means for releasing predetermined charges of air along said path of air flow in timed relation with the transfer of dust material increments thereto, and means for controlling the expansive efiiuent distribution of said increments in the form of an impalpable dry film.

21. In a device of the character described, the combination with a dust material supply source, of means including a scraper for maintaining a constant quantity of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, adjustable means for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, and means for controling the expansive efiiuent distribution of said increments in the form of an impalpable dry film.

22. In a device of the character described, the combination with a dust material supply source, of means for maintaining a constant level of dust material in said supply source, a compressed air sup-ply source for directing air under pressure and velocity along a predetermined path of flow, rotary scooping means adjustable relative to the dust material supply level for transferring predetermined increments of dust material from said supply source to said predetermined path of air flow, means for controlling the expansive efiluent distribution of said increments in the form of an impalpable dry film, and means for varying the relationship of the effective position of said rotary scooping means to the level of the dust material in said supply source.

23. In a device of the character described, the combination with a dust material supply source, of means for maintaining a constant level of dust material in said supply source, a compressed air supply source for directing air under pressure and velocity along a predetermined path of flow, rotary scooping means adjustable relative to the dust material supply level for transferring predetermined increments of dust material from said supply source to said predetermined path of air fiow, and means for releasing predetermined charges of air along said path of air flow in timed relation with the transfer of predetermined dust material increments thereto 'fo-r expansive distribution in the form of an impalpable dry film.

24. In a device of the character described, the combination with an air housing, of mean for supplying premeasured increments of dust material to said air housing, air-valved nozzle means in said air housing for producing an expansive dry spray of said dust material increments, and a distributor bell having an outwardly flaring discharge orifice communicating with said air housing to receive the dry expansive spray therefrom for controlled discharge over a substantially predetermined area.

25. In a device of the character described, the combination with an air housing, of means for supplying premeasured increments of dust material to said air housing, air-valved nozzle means in said air housing, means for operating said airvalved nozzle means in timed relation to said increment supplying means, scooping means adjustable relative to the dust material supply level for producing an expansive dry spray of said dust material increments, and a distributor bell having an outwardly flaring discharge orifice communicating with said air housing through a tortuous intermediate chamber to receive the dry expansive spray therefrom.

ARTHUR J. JENNER.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,566,800 MacArthur Dec. 22, 1925 1,659,179 Wilson Feb. 14, 1928 1,908,578 Vawter May 9, 1933 1,955,032 Leonard Mar. 19, 1935 2,093,995 Blow Sept. 28, 1937 

